Chapter 17SynthesisPaid chapter

Cost-Aware Design — Making Mechanics Actionable

Synthesize the mechanics from Chapters 1–16 into a repeatable framework for designing APIs and components that preserve compiler/runtime optimization opportunities.

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What this chapter teaches

Common belief

Optimize later; design for readability first and performance is a separate phase.

What actually happens

the mechanics from Chapters 1–16 are design-time levers. A few structural choices (concrete hot paths, value semantics, bounded data, pointer-free layouts) decide allocation and dispatch cost before a profiler ever runs.

Mechanisms covered

Ownership as a design primitive: who allocates, who retains, who releases — for slices, maps, goroutines, and pooled resources.

Separating hot and cold paths so readability improvements in cold paths don't tax throughput in hot paths.

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Escape Analysis — The Compiler's Fragile Decision

Understand how the compiler decides between stack and heap allocation, why the decision is fragile, and how to verify it.

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Maps — Swiss Tables, Growth, and Permanent Memory

Understand the Go 1.24+ Swiss Table map layout, why maps don't shrink, and how to design for memory reclamation.